What is blockchain ?

Jul 6, 20180 likes201 views

Blockchain is a decentralized peer-to-peer network that allows for transparent and immutable record keeping without a central authority. It uses a distributed ledger system stored across nodes in the network where transactions are grouped into blocks and linked in a chain. Each new block contains a hash of the previous block, making it difficult to tamper with transaction records once added to the chain. Miners work to verify transactions and add new blocks to the chain in exchange for rewards in bitcoin or transaction fees.

What is Blockchain?
ーfor beginnersー
Tomoaki | Waseda BITBEARS

＠tomoaki25_official
I am a illustrator designer.
A Blockchain researcher & developer.
The Co-founder of BITBEARS.
And then a student.

Active on Mon.&Tue. at Waseda
University building 3!
Feel free to DM us if you’re interested in
joining!:-)
@bitbears_wasedablockchain

Follow us and check out our latest updates! @waseda_BITBEARS

P2P network
Blockchain is a decentralized P2P network.
Decentralized

Why
decentralize?
Every time you use
the Internet, you
have to access a
server from your
device.
Current Internet
Server

Equifax data breach
名前、生年月日からソーシャルセキュリティ番号、
運転免許証、クレジットカードの情報までが漏え
い。被害は1.43億人に及んだ。
（2017年最大規模のデータ流出事件）

Edward Snowden’s confession
Edward Snowden
whitsleblower of The
NSA surviilance

You don’t have to rely on a third party.
“Trustless”

Blockchain contains blocks connected to chain.

Each block contains a “previous block hedder”.
transactions transactionstransactions
previous block
hedder
previous block
hedder
previous block
hedder
nonce noncenonce
Block hedder Block hedderBlock hedder
Block n Block n+2Block n+1

If changed...
Each block
contains
a“previous block
hedder”.

Blockchain is like multiple layers.
New blocks
Recent blocks
Old blocks
Very hard to change
Almost impossible to
change
You shouldn’t even think
about changing them

Why Bitcoin matters?
BlockchainUsers Miners
(12.5BTC+Fees)
Transaction
Transaction
Transaction
want to use Bitcoin but also want
someone to check the transactions.
want to earn Bitcoin.

Summary
Blockchain is...
Decentralized
P2P
Transparent
Immutable
Bitcoin is...
Decentralized
Autonomous

Blockchain is an incorruptible digital ledger that can record transactions of value such as financial or other transactions. It transitions trust from entities to trust in an algorithm through cryptography, blockchains, and consensus algorithms. This allows for decentralized trust and even anonymous transactions. Blockchain has evolved from cryptocurrencies like Bitcoin to include smart contracts on platforms like Ethereum that allow many use cases across private, consortium, and public networks. It could revolutionize how we think about concepts like money, organizations, social networks, and trade.

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Blockchain technology is a digital innovation that can significantly impact financial markets in the next few years. It allows for trustworthy and secure transactions through a distributed ledger maintained across a peer-to-peer network. A blockchain uses cryptography to record transactions in blocks that are chained together, making past records unalterable. While still developing, blockchain offers opportunities for trust and security across industries through features like smart contracts and distributed data storage. It remains to be seen how widely blockchain will be adopted and what applications may emerge in the future.

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This document provides an introduction to blockchain technology. It discusses the history of blockchain, which began with Bitcoin in 2009. Blockchain consists of a series of linked blocks containing transaction summaries secured using cryptography. Transactions are validated by nodes in a peer-to-peer network before being recorded in a new block added to the blockchain. Current applications include cryptocurrencies like Bitcoin, smart contracts, and distributed data storage. Advantages include security, transparency and decentralization, while disadvantages include volatility and implementation challenges. The future scope of blockchain is presented as significant for benefiting society through applications like identity management and data marketplaces.

Block chain technology RajeshJade

Blockchain technology was first introduced with the Hashcash algorithm in 1997 and later developed by Satoshi Nakamoto in 2008 to power bitcoin transactions via a consensus algorithm. It consists of blocks of information linked through cryptography to form a distributed ledger managed by a peer-to-peer network, allowing information to be recorded immutably. Participants approve transactions and add verified blocks to the chain through a consensus process. It provides high security, transparency, and accessibility without a central authority through cryptographic linking of chronological blocks.

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The document is a presentation on blockchain technology. It defines blockchain as an open, distributed ledger that offers decentralization, transparency, and immutability. It notes that blockchain was first introduced in the 2009 white paper that proposed Bitcoin. The presentation goes on to discuss how blockchain works, its benefits, different types of blockchain networks like public and private, and concludes that blockchain will revolutionize how transactions are made and information is stored by creating an immutable record of transactions.

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This document outlines a seminar on blockchain technology. It begins with an introduction to blockchain as a growing list of linked data blocks that cannot be altered. It then discusses the history of bitcoin and how it relates to blockchain as an application of the technology. The working of the bitcoin ecosystem is explained as a public, decentralized network that builds consensus among participants through increasing security and participation. Key features of blockchain like immutability, transparency, and decentralization without intermediaries are also highlighted. Challenges like energy usage and scalability are noted.

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This document provides an overview of block-chain technology and how it works. It explains that block-chain was originally created for Bitcoin as a digital ledger that distributes transaction data across a network of computers. Each computer holds a copy of the ledger and transactions are verified through consensus protocols. This makes the records more secure and transparent than a centralized system by preventing fraudulent transactions. The document also discusses how block-chain could improve online transactions by lowering security risks and errors through its distributed structure.

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This document provides an introduction to disruptive blockchain technology. It discusses the history of bitcoin and how the first blockchain network was launched in 2008. It defines blockchain as a growing list of linked data blocks. Blockchain technology features include cutting out middlemen, building consensus across participants, and creating witnesses to published information. Key features include immutable transparent data storage without intermediaries and a consistent state across all participants. Challenges include high energy consumption, scalability issues, and risks of money laundering and personal responsibility. The document outlines potential applications of blockchain in digital currency, securities, record keeping, and smart contracts.

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Blockchain technology is a dominant topic of innovation that could be bigger than the internet. It replaces the need for trusted third parties in transactions by using a decentralized, secure system of value exchange. Several years ago, Satoshi Nakamoto introduced the Bitcoin protocol, unleashing this new technology with the potential to rethink economic systems, similar to the introduction of the internet in 1993.

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This presentation covers the fundamentals of blockchain technology including: - Defining distributed systems and the types of faults they can experience. - Explaining that blockchain is a distributed ledger that is cryptographically-secure, append-only, and updateable only via consensus. - Detailing how blockchain technology developed from earlier concepts in distributed computing like hash functions and consensus mechanisms. - Identifying the key elements of a blockchain like blocks, transactions, addresses, and the peer-to-peer network. - Discussing the benefits of blockchain like decentralization, transparency, and security as well as limitations around scalability.

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The document discusses blockchain technologies and provides an overview of blockchain fundamentals. It defines blockchain as a distributed ledger developed in 2008 for Bitcoin. It explains that blockchain provides security, immutability and consistency through its decentralized architecture, consensus algorithms, and storing transactions in distributed blocks. The document also presents a case study of using blockchain for identity as a service (BIDaaS) and how it enables mutual authentication between users, partners and providers through encryption and digital signatures.

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A blockchain is a decentralized, distributed database that maintains a growing list of records called blocks. Each block contains a timestamp and link to the previous block. Bitcoin uses blockchain technology, where a peer-to-peer network monitors and verifies bitcoin transfers between users' digital wallets. A blockchain wallet allows users to easily send and receive bitcoins without bitcoin client software. In the future, blockchain is expected to facilitate global trade and disrupt sectors like banking, healthcare, and financial transactions through virtual currencies and distributed ledgers.

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Blockchain is a peer-to-peer public ledger maintained without a central authority. It consists of transaction records stored in blocks that are chronologically ordered. Blockchain has characteristics of openness, decentralization, security, and resilience. A famous example is Bitcoin, the first cryptocurrency. The brief history of blockchain began in 1991 with work on cryptographically secured chains of blocks, leading to Bitcoin's introduction in 2008. Applications of blockchain include cryptocurrencies, smart contracts, IoT security, and distributed DNS. However, challenges remain around scalability, regulation, integration, and privacy.

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The document discusses how blockchain technology can change the insurance industry. It explains that blockchain uses a distributed digital ledger that is incorruptible to record transactions. This allows for transparency, fraud prevention, and no single point of failure. Smart contracts enable the automatic execution of contracts without middlemen. For insurance, the blockchain can be used to verify property ownership and claims history, remove the need for certificates and audits, and provide permanent provenance and authentication of identities and transactions.

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Blockchain technology is gaining significant attention and investment from major banks and financial institutions. Banks are projected to invest $400 million in blockchain by 2019, and over 30% of firms surveyed have annual blockchain budgets over $5 million. Blockchain uses distributed ledger technology to securely record transactions in digitally recorded "blocks" that are linked together, allowing participants on a blockchain network to reach consensus on a single view of the truth. This consensus-based approach provides advantages over traditional centralized databases by enabling trustless verification and transparency across organizations without the need for intermediaries.

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What is blockchain ?

1. What is Blockchain? ーfor beginnersー Tomoaki | Waseda BITBEARS

2. ＠tomoaki25_official I am a illustrator designer. A Blockchain researcher & developer. The Co-founder of BITBEARS. And then a student.

3. Active on Mon.&Tue. at Waseda University building 3! Feel free to DM us if you’re interested in joining!:-) @bitbears_wasedablockchain

4. Follow us and check out our latest updates! @waseda_BITBEARS

5. What is BLOCKCHAIN? ❓

6. P2P network Blockchain is a decentralized P2P network. Decentralized

7. Why decentralize? Every time you use the Internet, you have to access a server from your device. Current Internet Server

8. Problems of the Internet.

9. Equifax data breach 名前、生年月日からソーシャルセキュリティ番号、運転免許証、クレジットカードの情報までが漏えい。被害は1.43億人に及んだ。（2017年最大規模のデータ流出事件）

10. Edward Snowden’s confession Edward Snowden whitsleblower of The NSA surviilance

11. If decentralized... Transparent

12. Safer when hacked

13. Hard to supervise

14. P2P networkWhat is P2P and Why?

15. If P2P...

16. You don’t have to rely on a third party. “Trustless”

17. How does BLOCKCHAIN work?

18. Blockchain contains blocks connected to chain.

19. What is Minning？ Gold Bitcoin

20. Each block contains a “previous block hedder”. transactions transactionstransactions previous block hedder previous block hedder previous block hedder nonce noncenonce Block hedder Block hedderBlock hedder Block n Block n+2Block n+1

21. If changed... Each block contains a“previous block hedder”.

22. Blockchain is like multiple layers. New blocks Recent blocks Old blocks Very hard to change Almost impossible to change You shouldn’t even think about changing them

23. Blockchain is immutable. immutable

24. Why Bitcoin matters? BlockchainUsers Miners (12.5BTC+Fees) Transaction Transaction Transaction want to use Bitcoin but also want someone to check the transactions. want to earn Bitcoin.

25. Summary Blockchain is... Decentralized P2P Transparent Immutable Bitcoin is... Decentralized Autonomous

26. Thank you

What is blockchain ?

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